在 SUM 函数中引用别名 - SQL 服务器

Question

背景：

我正在尝试计算查询内的利润率，但我运行出错了。当我尝试在 SUM 函数中使用 select 语句时，我触发了一个错误：

Cannot perform an aggregate function on an expression containing an
aggregate or a subquery.

我知道这是由于在 SUM 函数中有一个 SELECT 查询引起的。从那里，我尝试引用 COGS 列的别名。我这样做时也收到错误消息：

Invalid column name 'COGS'.

在进一步处理查询之后，我想这可能是因为我在 SUM 函数中尝试了所有这些，所以我删除了它和运行查询。它返回了一些错误：

Column 'tbl_invoice.subTotal' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

Column 'tbl_invoice.tradeinAmount' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

Column 'tbl_invoice.subTotal' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

Column 'tbl_invoice.tradeinAmount' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

Column 'tbl_invoice.subTotal' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

Column 'tbl_invoice.tradeinAmount' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

是否有其他方法可以在 SUM 函数中使用或引用我需要的值？

查询：

--Main query
SELECT 
custID,
COUNT(custID) AS InvoiceNum,

--This is the column that has an alias
(SELECT cogs FROM #tempMarketing where #tempMarketing.custID = tbl_invoice.custID) as COGS,
--This is where I am trying to calculate the profit margin
SUM(((((subTotal + (-1 * tradeinAmount) - (SELECT cogs FROM #tempMarketing where #tempMarketing.custID = tbl_invoice.custID))) 
/ (NULLIF(subTotal + (-1 * tradeinAmount),0))) *100)) as Profitmargin, 

FROM tbl_invoice 
group by custID
order by InvoiceNum desc;

Answer 1

您可以尝试以下查询，我为 cogs 列创建了一个通用 table 表达式：

WITH cte_base AS(
SELECT cogs FROM #tempMarketing where #tempMarketing.custID = tbl_invoice.custID
)
SELECT 
custID,
COUNT(custID) AS InvoiceNum,

--This is the column that has an alias
cte_base.cogs as COGS,
--This is where I am trying to calculate the profit margin
SUM(((((subTotal + (-1 * tradeinAmount) - (cte_base.cogs))) 
/ (NULLIF(subTotal + (-1 * tradeinAmount),0))) *100)) as Profitmargin, 

FROM tbl_invoice 
group by custID
order by InvoiceNum desc;

Answer 2

SELECT 
a.custID,
COUNT(a.custID) AS InvoiceNum,  case when a.custid=b.custid then b.cogs else 0 end 
 as COGS,
SUM(((((subTotal + (-1 * tradeinAmount) - case when a.custid=b.custid then b.cogs else 0 end)) 
/ (NULLIF(subTotal + (-1 * tradeinAmount),0))) *100)) as Profitmargin, 

FROM tbl_invoice a 
left join #tempMarketing b on a.custID =b.custid
group by a.custID, 
case when a.custid=b.custid then b.cogs else null end 
order by InvoiceNum desc;

在 SUM 函数中引用别名 - SQL 服务器

Reference an ALIAS in a SUM funciton - SQL Server

sql

sql-server

alias

sum

背景：

查询：